We had a problem of lint building up inside of the filter slot. Once I took a long brush and cleaned the recess where the filter slides I was able to see that the old filter was not catching all the lint. Upon closer examination I noticed that the seal around the filter had become compressed. that's when I order another filter from AppliancePartsPros.com. My new filter came within three days and my dryer has been working fine ever since then.

This was a pretty simple install if you know how to take apart your dryer. I have a kenmore dryer which is identical to an LG dryer. My kenmore dryer was actually made by LG at that time. You can find the specific model on youtube and see how your dryer comes apart. While doing this i cleaned all the inner parts of my dryer.
The parts that come in the kit can be bought at home depot for much less but you don't know what length you need. I ordered the kit so I could have the back plate and Kenmore parts so it would not void warranty. If you use parts from a hardware store the manufacturer may void warranty.
install was simple once I saw the youtube video.